import java.util.Scanner;

public class Example8_9 {

  public static void main (String args[ ]) {

      String regex = "[a-zA-Z|0-9|_]+"; 

      Scanner scanner = new Scanner(System.in);

      String str = scanner.nextLine();

      if(str.matches(regex)) {

          System.out.println(str+"是英文字母,数字或下划线构成"); 

      }

      else {

          System.out.println(str+"中有非法字符"); 

      }

   }

}
